
Here, with Black to move, Vigorito saw almost everything, including some brilliant points - but one idea eluded him.
Can you find what he missed? You have four advantages: you know something's there, you can move pieces around (though for best results, try to solve it, as they say, in your head), you don't have the pressure of a tournament situation to deal with, and your time is (relatively) unlimited. Even so, it's pretty tough!
The solution will be given in a few days. Please: do not use a computer or send in a comment with the correct answer!! (The first request is for your own sake - both instructionally and, more importantly, aesthetically. The second is for the benefit of those still working on it, but inclined to peek when an answer is given.)
The mating combo is nice.